How to port match cases?

[SlowMoe]

Yeah I'm getting ready to bolt my engine back up and I wanted to definately port match the cases as well as any other performance/ maintenance mods before I bolt her back up.

Does anyone have pics or can explain hor to do this?

Also someone mentioned drilling out the crank bearing lubricant holes...What size bit do I use?

 

Anything else?

 

Thanks, Slo

[jbooker82]

Lay you gasket on the bottom of the cylinder. Use the dowel pins to help hold the gasket centered. Then cut the gasket to match the transfer ports., Then lay a gasket over the top case half. Mark the case with a black marker. Only open the top part up. You dint want to open the whole thing cause you will go through the case and make a hole, especially on the stator side. You only go down a 1/2" or so. Pretty much just the vertical part. Where you see the bottom slope down you don't mess with.

 

I just used a 1 piece (one big gasket for both cylinders) big bore gasket. It has a thin metal sheet in between the paper layers. It is also opened up more than the factory paper gaskets.

Edited February 23, 2011 by jbooker82

[crustydemon]

Not good pictures but you might get the idea.

 

[Phelps]

for cub cylinders?

 

Andy at M&M does my port matching. it's done on a cnc so you know it's right. pretty sure it's 125 plus your shipping. worth every penny when it comes to possibly screwing up your cases doing it your self.